Replace Python numerical kernels with native C execution

tests/native_reference.py

@@ -0,0 +1,30 @@
+"""Rebuild networks from the Python baseline captured before its retirement."""
+import json
+from pathlib import Path
+
+from app.simulation.core.medium import IdealGasMedium
+from app.simulation.components.amesim.media.mediums import AmesimHeliumPengRobinsonMedium, AmesimIdealAirMedium
+from app.simulation.native_codegen.extended import catalog_contracts
+from app.simulation.systems.network import SimulationNetwork
+
+
+def reference_data():
+    return json.loads((Path(__file__).parent / 'data/native-python-reference.json').read_text(encoding='utf-8'))
+
+
+def reference_network(case):
+    net = SimulationNetwork('frozen_reference')
+    media = {}
+    medium_types = {cls.__name__: cls for cls in (IdealGasMedium, AmesimHeliumPengRobinsonMedium, AmesimIdealAirMedium)}
+    for item in case['components']:
+        spec = item['medium']
+        key = json.dumps(spec, sort_keys=True)
+        if key not in media:
+            media[key] = medium_types[spec['type']](**spec['parameters']) if spec else IdealGasMedium()
+        component = catalog_contracts()[item['type']].create(name=item['name'], medium=media[key], parameters=item['parameters'])
+        for name, value in item['overrides'].items():
+            setattr(component, name, value)
+        net.add_component(component)
+    for left, right in case['connections']:
+        net.connect(*left, *right)
+    return net